Valve-grinding tool



C. M. STEWART VALVE GRINDING TOOL Jan. 3, 1928. 1,655,344

Filed Jan. 15, 1927 2 Shets-Sheet l L Jnvew Ho's 61M. Jim/414.

C. M. STEWART VALVE GRINDING TOOL Jan, 3, 1928.

Filed Jan. 15, 1927 2 Sheets-Sheet 2 gnocnhn L, M. 52m;

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the tool,

Patented Jan. 3, 1928.

I 1,655,344" PATENT OFFICE.1

I CECIL lvrsrnwAnr, or DANA; INDIANA.

ALVE-GRINDING TOOL.

Application filed January 13, 1927. ,Serial No. 160,900.

This invention relates to tools for grinding the ralves of internal combustion engines for automobiles and the like, and has for one of its objects to improve and simrpli't'y the general construction of tools of this character and to provide one through the medium 01 which the, valves may be ground with ease and rapidity.

lVith the foregoing and other objects in view, the nature of which will become apparent as the description proceeds, the invention consists of the construction, combinafl tion and arrangement otparts hereinafter "fully described and claimed, and illustrated in'the accompanying drawings, wherein:

Figure 1 is a View in front elevation of a valve grinding tool constructed in accordance with my invention,

Figure 2 is a view in side elevation of Figure 3 is a view on an enlarged scale of the upper portion of the tool with one of the walls of its casing removed,

Figure 1 is a sectional view taken on the plane indicated by the line 1-4: of Figure 3,

Figures and '6 are sectional views illustrating the means by which the spindle ot' the tool is oscillated.

The valve grinding tool comprises a casing 1 which consists of an annular wall 2 and circular walls 3 and 4. The walls 3 and 4t are provided at their upper edges with lugs 5 which contact with the top side of the wall 2, and the walls 3and 4 are secured.

in place against the edges of the wall 2 by bolts 6 which pass through the casing. The wall 2 is provided adjacent its top side with inner bosses 7 which extend therefrom and through which two of the bolts 6 pass to hold the walls 2, 3 and 4 against relative rotation. A handle 8 is secured to the top side of the wall 2 centrally between the bosses 7. The shank'9 of the handle 8 and the lugs 5 of the walls 3 and 1, serve as guides which permit the walls 2, 3 and 4 to be readily assembled in a manner to arrange two of the bolt receiving openings in each of the walls 3 and 1 in registration with the bosses 7, whereby to permit the assembled walls to be readily secured together.

A bearing 10 is secured to the bottom side of the wall 2, and extends inwardly and outwardly beyond said wall. The bearing 10 has screw threaded engagement with the wall 2, and screw threadedly engaged. therewith and depending theretronris a sleeve 11. A spindle 12 is j ournaled in the bearing 10 and sleeve 11, and is provided at itslower end with a bit holder 13. The bit holder 13 ground, is removably secured to the holder by a cotter key 15. A plate 16 provided with right angularly related arms or cranks 17 and 18, is ,lixed to the reduced upperend 19 of the spindle 12, and rests upon the hearing 10 to support the spindle against down ward movement with respect to the casing 1. The spindle 12 is held against upward,

movement with respect'to the casing 1 by a conical bearing 20which fits in a conical recess 21 tormedin the upper end of the spindle portion'19. The bearing 20 is carried by and extends downwardly from a bar 22 which is arranged within the casing in chordal relation thereto and above the spindle 12 and plate 16. The bar 22 is provided with angular ends 23 which contact with the wall 2, and it is secured in place by rivets 2 1 which engage said ends and wall.

Bearings 25 and 26 are arranged at the axial center of the casing 1,'and are secured to the walls 3 and 1, respectively, by rivets 27 which engage said walls and ears 28 car ried by the bearings. The/bearing 26 eX- tends for a considerable distance beyond the wall 4. A shaft 29 is journaled in the bearings 25 and 26, and extends beyond the bearing 26. A collar 30 is mounted upon the shaft 29 in contact with the bearing 26, and a crank 31 has threaded engagement with the collar and contacts with the shaft. A handle 32 is secured to the the tree or outer end of the crank 31. The spindle 12 is adapted to be oscillated through themedium of the cranks 17 and 18 and wiper-wheels 33 and 341- which are fixed to a hub 35 splined to the shaft 29. The wipers 36 of the wheel 33 and the wipers 37 of the wheel 3 1 are arcuate, and the wipers of one wheel are arranged in staggered relation to those of the other. During the operation of the tool, the wipers 36 and 37 of the gear wheels 33 and 3 1 alternately contact with the cranks 18 and 17, with the result that the spindle 12 is oscillated. The movement of the spindle 12 in opposite directions is limited by a stop 38 depending from the bar 22 and occupying a position between the cranks 17 and 18, and due thereto said cranks cannot be moved out of their proper relation till to the wipers 36 and 37 when the tool is not in use.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains. While 1 have described the principle of operation of the invention, together with the device which I now consider to be the .best embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired. as are within the scope of the invention as claimed.

What is claimed is 1. A valve grinding tool comprising a casin a spindle journaled at one end in the casing and provided at its other end with valve engaging means, right angnlarl; related cranks secured to the spinnle within the casing, a bar secured within the casing at right angles to the spindle, a stop carried by the bar and positioned between the cranks, wiper-wheels rotatably supported within the casing and cooperating with the cranks at opposite sides of the bar to effect the oscillation of the spindle, the wipers of one wheel being arranged in staggered relation to those of the other, and wiper-wheel operating means.

2. A valve grinding tool comprising a casing, a bearing carried by the casing, a spindle journaled at its inner end in the bearing and provided at its outer end with valve engaging means, a plate secured to the inner end. of the spindle and resting upon the bearing and provided with right angularly related cranks, a. bar secured within the easing at right angles to the spindle and pro vided with a bearing contacting with the inner end of the spindle, wiper-wheels rotatably supported within the casing at opposite sides of the bar and cooperating with the cranks to effect the oscillation of the spindle, the wipers of one wheel being arranged in staggered relation to those of the other, and wiper-wheel operating means.

In testimony whereof I aiiii; my signature CECIL M. STEWART. 

